Network id convert to hex must be number NomicFoundation#100

Author: liangxiwei

frontend/src/components/Dapp.js

@@ -20,7 +20,7 @@ import { WaitingForTransactionMessage } from "./WaitingForTransactionMessage";
 import { NoTokensMessage } from "./NoTokensMessage";
 
 // This is the default id used by the Hardhat Network
-const HARDHAT_NETWORK_ID = '31337';
+const HARDHAT_NETWORK_ID = 31337;
 
 // This is an error code that indicates that the user canceled a transaction
 const ERROR_CODE_TX_REJECTED_BY_USER = 4001;